Calcium (Ca #20) is the next element on the periodic table for my APEX mineral collection.
Wikipedia Calcium
Fluorite (CaF2) with 51% Calcium is my choice for APEX Mineral. Other minerals with more Calcium are not common and are highly reactive.
Calcium metal is not produced in any quantity. It must be carefully stored to prevent reactions with air, water, etc.
Lime as building material was used since prehistoric times going as far back as 7000 to 14000 BC
Calcium minerals are mainly used in cements and mortars.
Calcium is essential for living organisms. It functions as a signaling mechanism and is a major component of bone, teeth and shells.
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